hi
@Quantock
welcome from me too
I agree; get in contact
do phone, but also ask for a name, if possible, and an e-mail and/or actual address - then immediately follow up with a note outlining what was said in the phone call - it helps to have a 'paper' trail to refer back to
maybe even ask for the details of the senior/manager Social Worker as a signal that you are more than prepared to take this further
if you honestly believe that your mum is near carer breakdown say so clearly as the 'duty of care' for your FIL lies with the LA, not your MIL, and you may want to push for some emergency respite
if your FIL has savings/assets (NOT including the marital home; that is disregarded in any financial assessment) over £23250 he will have to self-fund his care fees - so arranging home care visits yourself will have no real impact - your MIL's savings and income are not taken into account and only 50% of any monies held in their joint names
the Local Authority Adult Services should suggest a care package to include home care visits; also ask for some time at a day care centre (often this has to be through a referral rather than arranged privately), hours for a sitter, some respite time and for an Occupational therapist to come to their house to see if some aids/adaptions will help, possibly a telecare system too
if your FIL doesn't have that level of savings, the LA will at least part fund his care - make sure that your MIL's own finances are not used, she needs to look to her own future financial situation
if you haven't already, do look into Power of Attorney for each of them, so you have the legal authority to support them